<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title></title>
  <script>
      function ff() {
          var str = document.getElementById("xxx").value;
          var re = /\\"PropertyValues\\":\[\\"(.*?)\\"/;
          var matches = re.exec(str);
          alert(matches[0])
      }
  </script>
</head>
<body>
<input id = "xxx"></input>
<input id = "result"></input>
<button onclick="ff()" style=""></button>
</body>
</html>